Static Var Generator Control System and Control Method Based on DSP

Abstract

The invention discloses a DSP-based static var generator control system and control method. The control system comprises a signal conditioning circuit, a sliding mode controller, a non-inductance L decoupling controller, a space vector modulator, a drive circuit, a three-phase bridge circuit and a power system. By comprehensive control of a sliding mode variable structure and PI adjustment, control on capacitor voltage at a DC side and fast tracking compensation for reactive current can be achieved; the design is simple; and implementation is facilitated. Through sliding mode control and feedforward decoupling control of non-inductance parameters L, the control system has relatively good robustness on external interference and system parameter disturbance; the reactive current can be relatively well tracked dynamically; the fast reactive compensation performance of a static var generator is fully developed; and the DSP-based static var generator control system and control method can be more widely applied to engineering practice.

Description

technical field [0001] The invention relates to a static var generator, in particular to a DSP-based static var generator control system and control method, belonging to the technical field of power quality. Background technique [0002] As the pillar energy and economic lifeline of modern society, electric energy is one of the important symbols to measure a country's development level and comprehensive national strength. Reactive power is an important physical quantity in the field of electrical technology, which is used to establish and maintain a magnetic field in electrical equipment to complete the mutual conversion of electromagnetic energy. To ensure the safe operation of the power system, reactive power is indispensable. Unbalanced reactive power will cause system voltage fluctuations or even collapse, damage electrical equipment, and disrupt system stability. [0003] In the power system, since the grid load generally contains inductive loads such as coils, the gr...

AI Technical Summary

Problems solved by technology

The increase of reactive power will lead to the increase of current and apparent power, which will increase the capacity of generators, transformers and other electrical equipment and wire capacity.

At the same time, the size and cost of starting and control equipment and measuring instruments for power users will also increase.

[0005] (2) Equipment and line losses increase

[0006] (3) Increase the voltage drop of lines and transformers. If it is an impulsive reactive power load, it will also cause violent fluctuations in voltage, seriously affecting the quality of power supply

[0007] (4) The reactive power effect caused by the harmonic source will also bring a series of problems, such as harmonic loss, which will affect the normal operation of the equipment, cause vibration, heat, noise, malfunction of automatic devices, and interfere with the communication system, etc.

[0010] At present, most of the control systems of static var generators have shortcomings such as large volume, slow dynamic response speed, and inflexible use.

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